mplement a class Matrix that represents matrix objects with attributes

$1.$ cols $-$columns of the Matrix object, as a list of columns $($also lists$)$

$2.$ rows $-$rows of the Matrix object, as a list of rows $($also lists$)$

The constructor takes a Python list of rows as an argument, and constructs the columns

from these rows. If a list is not provided, the parameter defaults to an empty list.

You must implement the following methods in the Matrix class: